ShieldScatter: Improving IoT Security With Backscatter Assistance

Authors:
Zhiqing Luo Huazhong University of Science and Technology
Wei Wang Huazhong University of Science and Technology
Jun Qu Huazhong University of Science and Technology
Tao Jiang Huazhong University of Science and Technology
Qian Zhang Hong Kong University of Science and Technology

Introduction:

the authors present ShieldScatter, a lightweight system that attaches battery-free backscatter tags to single-antenna devices to shield the system from active attacks.

Abstract:

The lightweight protocols and low-power radio technologies open up many opportunities to facilitate Internet-of-Things (IoT) into our daily life, while their minimalist design also makes IoT devices vulnerable to many active attacks due to the lack of sophisticated security protocols. Recent advances advocate the use of an antenna array to extract !negrained physical-layer signatures to mitigate these active attacks. However, it adds burdens in terms of energy consumption and hardware cost that IoT devices cannot a"ord. To overcome this predicament, we present ShieldScatter, a lightweight system that attaches battery-free backscatter tags to single-antenna devices to shield the system from active attacks. The key insight of ShieldScatter is to intentionally create multi-path propagation signatures with the careful deployment of backscatter tags. These signatures can be used to construct a sensitive pro!le to identify the location of the signals' arrival, and thus detect the threat. We prototype ShieldScatter with USRPs and ambient backscatter tags to evaluate our system in various environments. The ∗Co-primary authors. †This is the corresponding author of the work.

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